Are Alien fans as 'active' as other sci-fi fans?

I'm wondering if Alien fans are 'passive' compared to other sci-fi fans or if the Alien fanbase in general participates in active fan activities such as cons, cosplay, fan fiction etc. What do you think about this?

I am also wondering wheather Alien fandom is primarily a US phenomenon or if Alien has a large fanbase in other countries. What are your impressions of this?

Deeming Alien fans "inactive" certainly isn't fair - but I have the idea that Alien fandom in general is more speculative than active/creative compared to massive phenomena like Star Wars, Star Trek, and also non-scifi stuff like the Marvel superheroes. Even if you take the size of the fanbases into comparison. I think the reasons for this can be found in the Alien storyline(s) and universe itself. As you have probably guessed my knowledge of Alien is quite limited compared to the hardcore fans you can probably find here. I am learning though...